:root {
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    
    --color-secondary: #f59e0b;
    --color-secondary-dark: #d97706;
    --color-secondary-light: #fbbf24;
    
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-dark: #0f172a;
    --color-bg-dark-alt: #1e293b;
    
    --color-text-primary: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-light: #ffffff;
    --color-text-muted: #94a3b8;
    
    --color-border: #e2e8f0;
    --color-border-dark: #334155;
    
    --color-success: #10b981;
    --color-error: #ef4444;
    --color-warning: #f59e0b;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    --container-max-width: 1200px;
    --container-padding: 1.5rem;
}


* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}


h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
}

h1 {
    font-size: var(--font-size-5xl);
}

h2 {
    font-size: var(--font-size-4xl);
}

h3 {
    font-size: var(--font-size-3xl);
}

h4 {
    font-size: var(--font-size-2xl);
}

h5 {
    font-size: var(--font-size-xl);
}

h6 {
    font-size: var(--font-size-lg);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-dark);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}


.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--spacing-2xl) 0;
}

.section__header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section__subtitle {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-xs);
}

.section__title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-md);
}


.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--container-padding);
    height: 70px;
}

.nav__logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.nav__menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav__link {
    font-weight: 500;
    color: var(--color-text-secondary);
    position: relative;
    padding: var(--spacing-xs) 0;
    transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link.active {
    color: var(--color-primary);
}

.nav__link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-primary);
}

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav__toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: all var(--transition-fast);
}


.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    padding-top: 70px;
    position: relative;
}

.hero__container {
    width: 100%;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xl);
}

.hero__content {
    text-align: center;
    max-width: 900px;
    width: 100%;
}

.hero__title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.2s forwards;
}

.hero__title-line {
    display: block;
}

.hero__title-line--first {
    opacity: 0;
    animation: slideInLeft 0.8s ease 0.4s forwards;
}

.hero__title-line--second {
    opacity: 0;
    animation: slideInRight 0.8s ease 0.6s forwards;
    color: var(--color-primary);
}

.hero__description {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.8s forwards;
}

.hero__buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-2xl);
    opacity: 0;
    animation: fadeInUp 0.8s ease 1s forwards;
}

.btn--hero {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
    min-width: 180px;
}

.hero__scroll {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background-color: var(--color-primary);
    color: var(--color-text-light);
    transition: all var(--transition-base);
    opacity: 0;
    animation: fadeInUp 0.6s ease 1.2s forwards;
}

.hero__scroll:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(4px);
}

.hero__scroll img {
    width: 24px;
    height: 24px;
    object-fit: contain;
    filter: brightness(0) invert(1);
}


.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-text-light);
}

.btn--primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn--secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn--secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-text-light);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn:disabled:hover {
    transform: none !important;
    box-shadow: var(--shadow-md);
}


.about__content {
    display: grid;
    grid-template-columns: auto 2fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    align-items: start;
}

.about__image {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    flex-shrink: 0;
}

.about__photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.about__text p {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
}

.about__text strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.about__info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.info__item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.info__label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info__value {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    font-weight: 500;
}


.services {
    margin-top: var(--spacing-2xl);
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.service-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

.service-card__icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary);
    color: var(--color-text-light);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.service-card__icon img {
    width: 32px;
    height: 32px;
    object-fit: contain;
    filter: brightness(0) invert(1);
}

.service-card__title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.service-card__description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-relaxed);
}

.service-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}


.portfolio {
    background-color: var(--color-bg-alt);
}

.portfolio__tabs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.portfolio__tab {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-secondary);
    background-color: transparent;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: var(--font-family);
}

.portfolio__tab:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.portfolio__tab.active {
    background-color: var(--color-primary);
    color: var(--color-text-light);
    border-color: var(--color-primary);
}

.portfolio__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.portfolio-card {
    opacity: 1;
    transform: translateY(0);
    transition: opacity var(--transition-base), transform var(--transition-base);
}

.portfolio-card.hidden {
    display: none;
}

.portfolio-card.fade-in {
    animation: fadeInUp 0.5s ease forwards;
}

.portfolio-card {
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.portfolio-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.portfolio-card__image {
    width: 100%;
    height: 240px;
    overflow: hidden;
    background-color: var(--color-bg-alt);
}

.portfolio-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.portfolio-card:hover .portfolio-card__image img {
    transform: scale(1.05);
}

.portfolio-card__content {
    padding: var(--spacing-lg);
}

.portfolio-card__title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.portfolio-card__description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-relaxed);
}

.portfolio-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.portfolio-card__links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.btn--small {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.btn--small svg,
.btn--small img {
    width: 16px;
    height: 16px;
    object-fit: contain;
    flex-shrink: 0;
}


.resume__section {
    margin-bottom: var(--spacing-2xl);
}

.resume__section-title {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
}

.timeline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    position: relative;
    padding-left: 0;
}

.timeline__item {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: var(--spacing-lg);
    position: relative;
    padding-left: 0;
}

.timeline__date {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
}

.timeline__content {
    flex: 1;
}

.timeline__title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-xs);
}

.timeline__source {
    font-size: var(--font-size-base);
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.timeline__description {
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}


.tools__tabs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.tools__tab {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-secondary);
    background-color: transparent;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: var(--font-family);
}

.tools__tab:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.tools__tab.active {
    background-color: var(--color-primary);
    color: var(--color-text-light);
    border-color: var(--color-primary);
}

.tools__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.tool-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: none;
    opacity: 1;
    transform: translateY(0);
}

.tool-card.hidden {
    display: none;
}

.tool-card.fade-in {
    animation: fadeInUp 0.5s ease forwards;
}


.tool-card__name {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.3;
}

.tool-card__badge {
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25rem 0.5rem;
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-sm);
}


.testimonials {
    background-color: var(--color-bg-alt);
}

.testimonials__carousel {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 60px;
    width: 100%;
    box-sizing: border-box;
}

.testimonials__track {
    display: flex;
    overflow: hidden;
    scroll-behavior: smooth;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    width: 100%;
}

.testimonial-card {
    min-width: 100%;
    max-width: 100%;
    scroll-snap-align: start;
    padding: var(--spacing-md);
    box-sizing: border-box;
    flex-shrink: 0;
}

.testimonial-card__content {
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.testimonial-card__content:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.testimonial-card__quote {
    margin-bottom: var(--spacing-md);
}

.testimonial-card__quote .quote-icon {
    width: 50px;
    height: 50px;
    opacity: 0.15;
    filter: brightness(0) saturate(100%) invert(37%) sepia(93%) saturate(1352%) hue-rotate(227deg) brightness(98%) contrast(96%);
}

.testimonial-card__text {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    font-style: italic;
}

.testimonial-card__author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.testimonial-card__avatar {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    overflow: hidden;
    flex-shrink: 0;
    border: 3px solid var(--color-primary);
}

.testimonial-card__avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.testimonial-card__info {
    flex: 1;
}

.testimonial-card__name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.testimonial-card__role {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.testimonials__btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    border: 2px solid var(--color-primary);
    background-color: var(--color-bg);
    color: var(--color-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.testimonials__btn--prev {
    left: 0;
}

.testimonials__btn--next {
    right: 0;
}

.testimonials__controls {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: var(--spacing-xl);
}

.testimonials__btn:hover {
    background-color: var(--color-primary);
    color: var(--color-text-light);
    transform: translateY(-50%) scale(1.1);
    box-shadow: var(--shadow-lg);
}

.testimonials__btn:active {
    transform: translateY(-50%) scale(0.95);
}

.testimonials__btn img {
    width: 20px;
    height: 20px;
    object-fit: contain;
    filter: brightness(0) saturate(100%) invert(37%) sepia(93%) saturate(1352%) hue-rotate(227deg) brightness(98%) contrast(96%);
}

.testimonials__btn:hover img {
    filter: brightness(0) invert(1);
}

.testimonials__btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.testimonials__indicators {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.testimonials__indicator {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background-color: var(--color-border);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    padding: 0;
}

.testimonials__indicator.active {
    background-color: var(--color-primary);
    width: 32px;
    border-radius: var(--radius-md);
}

.testimonials__indicator:hover {
    background-color: var(--color-primary-light);
}


.articles {
    background-color: var(--color-bg);
}

.articles__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.article-card {
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.article-card__image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background-color: var(--color-bg-alt);
}

.article-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.article-card:hover .article-card__image img {
    transform: scale(1.05);
}

.article-card__content {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    flex: 1;
}

.article-card__meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.article-card__date {
    color: var(--color-text-secondary);
}

.article-card__category {
    color: var(--color-primary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: var(--font-size-xs);
    letter-spacing: 0.05em;
}

.article-card__title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: var(--line-height-tight);
}

.article-card__excerpt {
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
    flex: 1;
}

.article-card__link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-primary);
    font-weight: 600;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    margin-top: auto;
}

.article-card__link:hover {
    color: var(--color-primary-dark);
    gap: var(--spacing-sm);
}

.article-card__link img {
    width: 16px;
    height: 16px;
    object-fit: contain;
    transition: transform var(--transition-fast);
}

.article-card__link:hover img {
    transform: translateX(4px);
}


.contact {
    background-color: var(--color-bg-alt);
}

.contact__content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.contact__info p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
}

.contact__details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact__link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-primary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.contact__link:hover {
    color: var(--color-primary);
}

.contact__link svg,
.contact__link img {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    object-fit: contain;
}


.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form__group {
    position: relative;
}

.form__group input,
.form__group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.form__group input:focus,
.form__group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form__group input.error,
.form__group textarea.error {
    border-color: var(--color-error);
}

.form__group textarea {
    resize: vertical;
    min-height: 120px;
}

.form__message {
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-sm);
    display: none;
}

.form__message.success {
    display: block;
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    border: 1px solid var(--color-success);
}

.form__message.error {
    display: block;
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
    border: 1px solid var(--color-error);
}


.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: var(--font-size-xs);
    font-weight: 500;
    background-color: var(--color-bg-alt);
    color: var(--color-text-primary);
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
}



.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background-color: var(--color-primary);
    color: var(--color-text-light);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.back-to-top:active {
    transform: translateY(-2px);
}

.back-to-top svg,
.back-to-top img {
    width: 20px;
    height: 20px;
    object-fit: contain;
    filter: brightness(0) invert(1);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
        --container-padding: 1rem;
    }
    
    .nav__menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--color-bg);
        flex-direction: column;
        padding: var(--spacing-xl);
        box-shadow: var(--shadow-lg);
        transition: left var(--transition-base);
    }
    
    .nav__menu.active {
        left: 0;
    }
    
    .nav__toggle {
        display: flex;
    }
    
    .nav__toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .nav__toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav__toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
    
    .hero__buttons {
        flex-direction: column;
    }
    
    .about__content {
        grid-template-columns: 1fr;
        justify-items: center;
    }
    
    .about__image {
        width: 150px;
        height: 150px;
        margin-bottom: var(--spacing-lg);
    }
    
    .services__grid {
        grid-template-columns: 1fr;
    }
    
    .portfolio__grid {
        grid-template-columns: 1fr;
    }
    
    .tools__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .timeline__item {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .timeline__date {
        margin-bottom: var(--spacing-xs);
    }
    
    .contact__content {
        grid-template-columns: 1fr;
    }
    
    .tech-stack-list {
        grid-template-columns: 1fr;
    }
    
    .testimonials__carousel {
        padding: 0 50px;
        max-width: 100%;
    }
    
    .testimonial-card {
        padding: var(--spacing-sm);
    }
    
    .testimonial-card__content {
        padding: var(--spacing-lg);
    }
    
    .testimonial-card__text {
        font-size: var(--font-size-base);
        line-height: var(--line-height-normal);
    }
    
    .testimonial-card__author {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    .testimonial-card__avatar {
        width: 50px;
        height: 50px;
    }
    
    .testimonial-card__name {
        font-size: var(--font-size-base);
    }
    
    .testimonial-card__role {
        font-size: var(--font-size-xs);
    }
    
    .testimonials__btn {
        width: 40px;
        height: 40px;
    }
    
    .testimonials__btn:hover {
        transform: translateY(-50%) scale(1.05);
    }
    
    .testimonial-card__quote .quote-icon {
        width: 40px;
        height: 40px;
    }
    
    .articles__grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .back-to-top {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 44px;
        height: 44px;
    }
}

@media (max-width: 480px) {
    .hero__title {
        font-size: var(--font-size-3xl);
    }
    
    .tools__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
    
    .tool-card {
        padding: var(--spacing-md);
    }
    
    
    .tool-card__name {
        font-size: var(--font-size-sm);
    }
    
    .section__title {
        font-size: var(--font-size-2xl);
    }
    
    .testimonials__carousel {
        padding: 0 40px;
        max-width: 100%;
    }
    
    .testimonial-card {
        padding: var(--spacing-xs);
    }
    
    .testimonial-card__content {
        padding: var(--spacing-md);
    }
    
    .testimonial-card__text {
        font-size: var(--font-size-sm);
        line-height: var(--line-height-normal);
        margin-bottom: var(--spacing-md);
    }
    
    .testimonial-card__author {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
        padding-top: var(--spacing-sm);
    }
    
    .testimonial-card__avatar {
        width: 45px;
        height: 45px;
    }
    
    .testimonial-card__name {
        font-size: var(--font-size-sm);
    }
    
    .testimonial-card__role {
        font-size: var(--font-size-xs);
    }
    
    .testimonial-card__quote .quote-icon {
        width: 35px;
        height: 35px;
    }
    
    .testimonials__btn {
        width: 36px;
        height: 36px;
    }
    
    .testimonials__btn img {
        width: 16px;
        height: 16px;
    }
}

@media (max-width: 360px) {
    .testimonials__carousel {
        padding: 0 35px;
    }
    
    .testimonial-card__content {
        padding: var(--spacing-sm);
    }
    
    .testimonial-card__text {
        font-size: var(--font-size-xs);
    }
    
    .testimonials__btn {
        width: 32px;
        height: 32px;
    }
    
    .testimonials__btn img {
        width: 14px;
        height: 14px;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-text-light);
    padding: var(--spacing-sm);
    z-index: 1001;
    text-decoration: none;
}

.skip-link:focus {
    top: 0;
}